Real-Time Nonlinear Signal Processing Super Resolution Of 8k Endoscope Cameras

Presently, 8K is the highest resolution of video systems. Originally, 8K research started only for broadcasting services. However, aside from broadcasting, 8K resolution video systems have also an important application in medical field, and endoscopic surgery is in its practical stage. In endoscopic surgery, a 0.02 mm thread is used. This 0.02 mm thread is not visible when using a 4K endoscope. However, when an 8K endoscope is employed, the thread is visible; however, fine focus is still necessary. Moreover, adjusting the focus of 8K by using the common tools only, such as view finders or small monitors, is very difficult. Hence, commercial HD/4K cameras are equipped with auto-focus functions; however, the central areas are not always the focus points. The focus is very deep and the focus points change during endoscopic surgeries. Owing to these reasons, a surgeon should manually control the endoscope focus. It is always very difficult to adjust the focus accurately. Super resolution (SR) has been proposed to sharpen out-of-focus images. However, a real-time SR technology is necessary for the 8K endoscope. In this study, a nonlinear signal processing super resolution (NLSP) is introduced to improve the resolution of 8K endoscope cameras. NLSP can enhance the 8K endoscope images and improve the camera's focus depth.